166 



THE ENTOMOLOGIST. 



sent me there were some pink forms mixed with the green 

 and yellowish green normal specimens. The winged females 

 that have come from the pink forms are identical with those 

 from the green ones. 



I found that this aphis lives quite well underground, and the 

 alate females emerged from the soil in which I had placed one 

 of the diseased tubers. It thus looks as if this aphis lays its 

 ova on the tubers in the autumn, and there they remain until 

 they sprout and so are ready to work on the young shoots. A 

 few years ago I remember finding a few aphis eggs on some 

 potatoes, and probably they were of this species. 



I have no other records of it outside Kent except Kalten- 

 bach's. Walker in his List (p. 990) also refers to it with a query 

 as a synonym of dianthi, Schrank. It clearly comes in the genus 

 Rhopalosiphum, the cornicles being most marked in the alate and 

 apterous females, but not in the larvfe and nymphs. 



Alate female, first generation. — ^Head black ; antennae brown, 

 basal segment black, the second also rather dark, the third a little 

 longer than the fourth, the fourth a little longer than the fifth, the 

 sixth nearly as long as the fourth and fifth, the third with eight to 

 ten sensoria on one side along nearly the whole length of the seg- 

 ment, the remainder of segments are striated (Fig. I., a). 



Fig. I. —RItopalosiphum solani, Kalt. 

 A. Third antennal segment (winged female). B. Cauda. 



Thorax : collar yellow, disc black in the centre, yellowish around 

 and on the sides, which have also black areas. The black area not 

 markedly trilobed as in B. dianthi. 



